Chrony is NTP client alternatives. It can synchronize the clock with an accurate time and speed, and it is very useful for those who are not online all-weather system.
chronyd smaller, more energy efficient, it uses less memory and only when it is needed only to wake up CPU. Even if the network is congested for a long time, it can also work well. It supports hardware time stamp on Linux, allowing extremely accurate synchronization in a local network.
It provides the following two services.
chronyc: Chrony command-line interface.chronyd: Chrony daemon service.